Systems and methods for estimation of a population of passive RFID sensors
First Claim
1. A method for estimating a population of Radio Frequency Identification (RFID) sensors in an area based upon responses during an interrogation frame processed by a processing system in a transceiver system receiving the responses comprising:
- receiving responses from RFID sensors during a plurality of time slots of the interrogation frame;
determining a contention resolution of each of the plurality of time slots;
determining an address in a lookup table stored in memory based upon the contention resolutions of the time slots;
reading a probability of a state in a state machine representing the contention resolutions of the plurality of time slots in the interrogation frame from the address in the lookup table wherein the lookup table stores the probability of each state in the state machine at a particular address of the lookup table; and
determining an estimate of the population of the RFID sensors in the area based upon the reading of the probability of the state in the state machine and maximum a posteriori probability estimation.
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Accused Products
Abstract
Systems and methods for providing an estimate of a population of passive Radio Frequency Identification (RFID) sensors in a coverage area of an RFID reader system are disclosed. In accordance with embodiments of this invention, the contention resolutions or results of each slot in an interrogation receive frame are determined. The contention resolutions are then used to determine the probabilities of different population estimates. A population estimate is then selected as the population based on the probability of the estimate meeting predetermined criteria.
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Citations
17 Claims
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1. A method for estimating a population of Radio Frequency Identification (RFID) sensors in an area based upon responses during an interrogation frame processed by a processing system in a transceiver system receiving the responses comprising:
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receiving responses from RFID sensors during a plurality of time slots of the interrogation frame; determining a contention resolution of each of the plurality of time slots; determining an address in a lookup table stored in memory based upon the contention resolutions of the time slots; reading a probability of a state in a state machine representing the contention resolutions of the plurality of time slots in the interrogation frame from the address in the lookup table wherein the lookup table stores the probability of each state in the state machine at a particular address of the lookup table; and determining an estimate of the population of the RFID sensors in the area based upon the reading of the probability of the state in the state machine and maximum a posteriori probability estimation. - View Dependent Claims (2, 3, 4, 5, 12, 13, 14)
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6. A device for providing an estimate of a population of passive Radio Frequency Identification (RFID) sensors in a coverage area of a RFID reader system comprising:
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a memory; and a processor configured via one or more applications stored in the memory to; receive responses from RFID sensors during a plurality of time slots of an interrogation frame, determine a contention resolution of each of the plurality of time slots, read a probability of a state in a state machine representing the contention resolutions of the plurality of time slots in the interrogation frame from the address in the lookup table wherein the lookup table stores the probability of each state in the state machine at a particular address of the lookup table, and determine an estimate of the population of the RFID sensors in the area based upon the reading of the probability of the state in the state machine read and maximum a posteriori probability estimation. - View Dependent Claims (7, 8, 9, 10, 15, 16, 17)
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11. A non-transitory machine readable medium containing processor instructions, where execution of the instructions by a processor causes the processor to perform a process for estimating a population of Radio Frequency Identification (RFID) sensors in an area based upon responses during an interrogation frame processed by a processing system in a transceiver system receiving the responses comprising:
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receiving responses from RFID sensors during a plurality of time slots of the interrogation frame; determining a contention resolution of each of the plurality of time slots;
read a probability of a state in a state machine representing the contention resolutions of the plurality of time slots in the interrogation frame from the address in the lookup table wherein the lookup table stores the probability of each state in the state machine at a particular address of the lookup table; anddetermine an estimate of the population of the RFID sensors in the area based upon the reading of the probability of the state in the state machine read and maximum a posteriori probability estimation.
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Specification